I think you have misunderstood something. I found a thread on Muff, and the Expert Sleepers guy basically said it was fine. But on some devices that process the midi before sending it out it could be a problem.
Not trying to be a jerk. But in these days it is so easy for someone to remember what you wrote, and think that Usamo to midi through never works.
I have connected my Usamo to Force midi in, and send midi out to a midi patchbay distributing the clock from Force to my other gear. I have always had good luck in sending midi clock out of a device, instead of using midi through.
Added a quote from the muff thread.
" Quote:
Also is it bad to daisy chain devices for midi clock?
In general that should be fine, using MIDI Thru. Any device that actually processes the MIDI is suspect unless tested and shown to not introduce timing issues."